One-piece tool holder



FIG. 1 is an upper perspective view of a one-piece tool holder showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is an opposite side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a lower perspective view thereof.

The dot-dash-dot broken lines immediately adjacent the shaded areas in FIGS. 1-5 and 7 are boundary lines, which form no part of the claimed design. The remaining broken lines shown in the drawings illustrate portions of the one-piece tool holder that form no part of the claimed design. 

CLAIM The ornamental design for a one-piece tool holder, as shown and described. 